Investments (Equity Method Investments, Statement of Financial Position) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014		Dec. 31, 2013
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Summarized Financial Information, Assets	$ 50,602	[1]	$ 51,588	[1]
Equity Method Investment, Summarized Financial Information, Liabilities	13,152	[2]	10,868	[2]
Equity Method Investment, Summarized Financial Information, Equity or Capital	37,450		40,720
Equity Method Investment, Summarized Financial Information, Liabilities and Equity	50,602		51,588
Equity Method Investment, Underlying Equity in Net Assets	4,599		3,765
Equity Method Investment, Underlying Equity in Net Assets Not Included Above	42		350
Equity Method Investments	$ 4,641		$ 4,115

[1] Assets consist primarily of investments in real estate, investments in securities and other miscellaneous assets.

[2] Liabilities consist primarily of third party-borrowed funds, securities repurchase agreements and other miscellaneous liabilities.